diff --git a/javascript/package.json b/javascript/package.json
index 92f9b32..71fd5ec 100644
--- a/javascript/package.json
+++ b/javascript/package.json
@@ -14,7 +14,7 @@
   "license": "MIT",
   "exports": {
     ".": {
-      "import": "./dist/index.js",
+      "import": "./dist/index.mjs",
       "require": "./dist/cjs/index.js"
     },
     "./package.json": "./package.json"
diff --git a/javascript/rollup.config.js b/javascript/rollup.config.js
index c4c9bc9..464c357 100644
--- a/javascript/rollup.config.js
+++ b/javascript/rollup.config.js
@@ -27,6 +27,8 @@ export default {
     {
       dir: isCJSBuild ? 'dist/cjs' : 'dist',
       format: isCJSBuild ? 'cjs' : 'esm',
+      entryFileNames: isCJSBuild ? '[name].js' : '[name].mjs', // Output file name pattern
+      chunkFileNames: isCJSBuild ? '[name]-[hash].js' : '[name]-[hash].mjs', // For code splitting
     },
   ],
   plugins: [ts({ tsconfig: isCJSBuild ? 'tsconfig.cjs.json' : 'tsconfig.json' }), commonjsPkgJSONPlugin()],